Focal Loss for Dense Object Detection
Thehighestaccuracyobjectdetectorstodatearebasedonatwo-stageapproachpopularizedbyR-CNN,whereaclassifierisappliedtoasparsesetofcandidateobjectlocations.Incontrast,one-stagedetectorsthatareappliedoveraregular,densesamplingofpossibleobjectlocationshavethepotentialtobefasterandsimpler,